Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution

	Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution
	Limousin, M.1,2; Richard, J.3; Kneib, J-P 4; Brink, H.2; Pello, R.5; Jullo, E.4; Tu, H.6,7,8; Sommer-Larsen, J.2,9; Egami, E.10; Michalowski, M. J.2
刊名	ASTRONOMY & ASTROPHYSICS
	2008-10-01
卷号	489 期号:1 页码:23-U64
关键词	gravitational lensing galaxies : clusters : individual : Abell 1703 dark matter
英文摘要	Properties of dark matter haloes can be probed observationally and numerically, and comparing both approaches provides ways to constrain cosmological models. When it comes to the inner part of galaxy cluster scale haloes, interaction between the baryonic and the dark matter component is an important issue that is far from being fully understood. With this work, we aim to initiate a program coupling observational and numerical studies to probe the inner part of galaxy clusters. In this article, we apply strong lensing techniques on Abell 1703, a massive X-ray luminous galaxy cluster at z = 0.28. Our analysis is based on imaging data from both the space and ground in 8 bands, complemented by a spectroscopic survey. Abell 1703 is rather circular from the general shape of its multiply imaged systems and is dominated by a giant elliptical cD galaxy in its centre. This cluster exhibits a remarkable bright central ring formed by 4 images at z(spec) = 0.888 only 5-13 '' away from the cD centre. This unique feature offers a rare lensing constrain for probing the central mass distribution. The stellar contribution from the cD galaxy (similar to 1.25 x 10(12) M(circle dot) within 30 kpc) is accounted for in our parametric mass modelling, and the underlying smooth dark matter component distribution is described using a generalized NFW profile parametrized with a central logarithmic slope alpha. The rms of our mass model in the image plane is equal to 1.4 ''. We find that within the range where observational constraints are present (from similar to 20 kpc to similar to 210 kpc), a is equal to 1.09(-0.11)(+0.05) (3 sigma confidence level). The concentration parameter is equal to c(200) similar to 3.5, and the scale radius is constrained to be larger than the region where observational constraints are available (r(s) = 730(-75)(+15) kpc). The 2D mass is equal to M(210 kpc) = 2.4 x 10(14) M(circle dot). However, we cannot draw any conclusions on cosmological models at this point since we lack results from realistic numerical simulations containing baryons to make a proper comparison. We advocate the need for a large sample of well observed (and well constrained) and simulated unimodal relaxed galaxy clusters in order to make reliable comparisons and to potentially provide a test of cosmological models.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	HUBBLE-SPACE-TELESCOPE ; LUMINOUS GALAXY CLUSTERS ; HIGH-REDSHIFT GALAXIES ; STAR-FORMING GALAXIES ; DENSITY PROFILES ; MASS-DISTRIBUTION ; ADIABATIC CONTRACTION ; GALACTIC CANNIBALISM ; CHANDRA OBSERVATIONS ; HALO CONCENTRATIONS
收录类别	SCI
语种	英语
WOS记录号	WOS:000259347400004
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19518]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Toulouse, Lab Astrophys Toulouse Tarbes, CNRS, F-65000 Tarbes, France 2.Univ Copenhagen, Dark Cosmol Ctr, Niels Bohr Inst, DK-2100 Copenhagen, Denmark 3.CALTECH, Dept Astron, Pasadena, CA 91125 USA 4.Univ Aix Marseille 1, CNRS, Lab Astrophys Marseille, F-13388 Marseille 13, France 5.Univ Toulouse, Lab Astrophys Toulouse Tarbes, CNRS, F-31400 Toulouse, France 6.Shanghai Normal Univ, Dept Phys, Shanghai 200234, Peoples R China 7.CNRS, Inst Astrophys Paris, F-75014 Paris, France 8.Shanghai Astron Observ, Shanghai 200030, Peoples R China 9.Tech Univ Munich, D-85748 Garching, Germany 10.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Limousin, M.,Richard, J.,Kneib, J-P,et al. Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution[J]. ASTRONOMY & ASTROPHYSICS,2008,489(1):23-U64.
APA	Limousin, M..,Richard, J..,Kneib, J-P.,Brink, H..,Pello, R..,...&Stark, D. P..(2008).Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution.ASTRONOMY & ASTROPHYSICS,489(1),23-U64.
MLA	Limousin, M.,et al."Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution".ASTRONOMY & ASTROPHYSICS 489.1(2008):23-U64.